Question about Credit Cards & Minimum Payments

[Reality]

I have a Paypal Smart Connect (Used to be called Buyer Credit) account, which is essentially a Paypal Credit Card you can use on any site that allows Paypal as a payment method. I stopped using the card two months ago as the balance was pretty high and decided I would just start paying it off. My minimum payment last month was $99.00, so I dropped $200.00 on the card. I expected to see a slightly lower minimum payment this month.

nope!

Minimum payment now is $107.00

Is this normal? If not, wtf? Anybody here have any idea why my minimum payments are going up, when the card isn't being used and I'm paying twice the minimum each month?

[Reality]

Just went through all my statements from the last 6 months, there was a purchase late December that had no interest if paid in 6 months, the interest kicked in as one lump sum on this statement and caused my balance to increase to ~what it was before I paid $200 last month, so I figured it out!